code: def y(self):
      self.y_call_count += 1
      return self.h * 3
  
file_path: chainer/tests/chainer_tests/utils_tests/test_cache.py
imports: import unittest
  import numpy
  import chainer
  from chainer import testing
  from chainer.utils import cache
label_desc: Use image node_id 3 for calling the MockDistribution obj's underlying member method code with example usage: obj.y() and returns: unknown